Hello,
I've come across this issue since the L&D update. I've tried taking out mods and cc and the issue persists. I've tried starting a new game and it fixes it for a short amount of time but the longer I play the slower the game gets until its freezing again and I'm back in the same issue. I'm also experiencing the same issue I've seen other describe as lag when clicking on fridge/sim for the pie menu.
When the game freezes/lags it typically happens around the 4am in sim time and I cannot switch between sims/click anything. It will 'unfreeze' for a moment, reset time, and then freeze again seconds later. It's making the game unplayable, with or without mods.
I've attached my dxdiag.
Please help!